Looks like they're putting the TT GT500 rumor to bed, at least for now. 2013 GT500 will still be supercharged, but a 5.8L with 600-620hp. Facelift of current Mustang for either 2013 or 2014 model year. Confirmed complete re-design for the regular Mustang in 2014 for the 2015 model year (smaller and IRS).